Vintage black 60s French kitten heels size 8.5 or 9.

I purchased these cute vintage heels in Spain but they say made in France. I can’t tell the actual size, but I wear an 8.5 and they fit me well. The insert of the right shoe is partially missing. Please see photo. Besides that they’re in great vintage shape, especially the soles! Exterior sole from point to heel is about 11 inches. Interior sole from point to heel is about 10.5 inches.